Concreto modificado mediante sustitución parcial de OPC con polvo de bloques de piedra pómez proveniente de la demolición

Abstract

Abstract: The growing demand for Ordinary Portland Cement (OPC) and the high CO2 emissions generated in the manufacturing process are prompting the search for alternatives to reduce the amount of OPC in concrete using materials with pozzolanic properties. Demolition pumice blocks (PBD) contain products that have been subjected to high temperatures, generating pozzolanic properties. The chemical composition of PBD was studied, and the stone aggregates were characterized for the manufacture of 26 MPa concrete templates. PBD was used as a partial replacement for OPC at 0%, 3%, 6%, 9%, 12%, and 15% by weight of OPC. Workability and compressive strength were evaluated at 7, 14, and 28 days of curing. The results indicated that increasing the replacement percentage reduces slump. Compressive strength is higher with 6% substitution, increasing by 5.56% compared to standard concrete. CO2 emissions from OPC concrete manufacturing decrease as substitution with PBD increases, indicating sustainability due to the influence of the pozzolanic material.